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Femoroacetabular Impingement
Julia R. Crim, MD
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        TERMINOLOGY

        • Definitions

          • Femoroacetabular impingement (FAI): Morphologic abnormalities of acetabulum, proximal femur, or both
            • Abnormal morphology causes femoral head/neck junction to impinge against acetabulum
          • Cam impingement: Due to nonspherical femoral head impinging against acetabulum
          • Pincer impingement: Due to abnormal morphology of acetabulum impinging against femur
          • Mixed impingement: Both cam and pincer morphology present

        IMAGING

        • Imaging Recommendations

          • MR Findings

            • Radiographic Findings

              • CT Findings

                CLINICAL ISSUES

                • Presentation

                  • Demographics

                    • Natural History & Prognosis

                      • Treatment

                        • Differential Diagnosis

                          • Field of FAI Research and Treatment Has Many Controversies

                            DIAGNOSTIC CHECKLIST

                            • Consider

                              • Image Interpretation Pearls

                                • Reporting Tips

                                  Selected References

                                  1. Linda DD et al: Accuracy of non-arthrographic 3T MR imaging in evaluation of intra-articular pathology of the hip in femoroacetabular impingement. Skeletal Radiol. 46(3):299-308, 2017
                                  2. Saied AM et al: Accuracy of magnetic resonance studies in the detection of chondral and labral lesions in femoroacetabular impingement: systematic review and meta-analysis. BMC Musculoskelet Disord. 18(1):83, 2017
                                  3. Frank JM et al: Prevalence of femoroacetabular impingement imaging findings in asymptomatic volunteers: a systematic review. Arthroscopy. 31(6):1199-204, 2015
                                  4. Naraghi A et al: MRI of Labral and chondral lesions of the hip. AJR Am J Roentgenol. 205(3):479-90, 2015
                                  5. Nardo L et al: Femoroacetabular impingement: prevalent and often asymptomatic in older men: the osteoporotic fractures in men study. Clin Orthop Relat Res. 473(8):2578-86, 2015
                                  6. Sutter R et al: Hip MRI: how useful is intraarticular contrast material for evaluating surgically proven lesions of the labrum and articular cartilage? AJR Am J Roentgenol. 202(1):160-9, 2014
                                  7. Anderson LA et al: Coxa profunda: is the deep acetabulum overcovered? Clin Orthop Relat Res. 470(12):3375-82, 2012
                                  8. Tannast M et al: Femoroacetabular impingement: radiographic diagnosis--what the radiologist should know. AJR Am J Roentgenol. 188(6):1540-52, 2007
                                  9. James SL et al: MRI findings of femoroacetabular impingement. AJR Am J Roentgenol. 187(6):1412-9, 2006
                                  10. Pfirrmann CW et al: Cam and pincer femoroacetabular impingement: characteristic MR arthrographic findings in 50 patients. Radiology. 240(3):778-85, 2006
                                  Related Anatomy
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                                  Related Differential Diagnoses
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                                  References
                                  Tables

                                  Tables

                                  KEY FACTS

                                  • Terminology

                                    • Imaging

                                      • Top Differential Diagnoses

                                        TERMINOLOGY

                                        • Definitions

                                          • Femoroacetabular impingement (FAI): Morphologic abnormalities of acetabulum, proximal femur, or both
                                            • Abnormal morphology causes femoral head/neck junction to impinge against acetabulum
                                          • Cam impingement: Due to nonspherical femoral head impinging against acetabulum
                                          • Pincer impingement: Due to abnormal morphology of acetabulum impinging against femur
                                          • Mixed impingement: Both cam and pincer morphology present

                                        IMAGING

                                        • Imaging Recommendations

                                          • MR Findings

                                            • Radiographic Findings

                                              • CT Findings

                                                CLINICAL ISSUES

                                                • Presentation

                                                  • Demographics

                                                    • Natural History & Prognosis

                                                      • Treatment

                                                        • Differential Diagnosis

                                                          • Field of FAI Research and Treatment Has Many Controversies

                                                            DIAGNOSTIC CHECKLIST

                                                            • Consider

                                                              • Image Interpretation Pearls

                                                                • Reporting Tips

                                                                  Selected References

                                                                  1. Linda DD et al: Accuracy of non-arthrographic 3T MR imaging in evaluation of intra-articular pathology of the hip in femoroacetabular impingement. Skeletal Radiol. 46(3):299-308, 2017
                                                                  2. Saied AM et al: Accuracy of magnetic resonance studies in the detection of chondral and labral lesions in femoroacetabular impingement: systematic review and meta-analysis. BMC Musculoskelet Disord. 18(1):83, 2017
                                                                  3. Frank JM et al: Prevalence of femoroacetabular impingement imaging findings in asymptomatic volunteers: a systematic review. Arthroscopy. 31(6):1199-204, 2015
                                                                  4. Naraghi A et al: MRI of Labral and chondral lesions of the hip. AJR Am J Roentgenol. 205(3):479-90, 2015
                                                                  5. Nardo L et al: Femoroacetabular impingement: prevalent and often asymptomatic in older men: the osteoporotic fractures in men study. Clin Orthop Relat Res. 473(8):2578-86, 2015
                                                                  6. Sutter R et al: Hip MRI: how useful is intraarticular contrast material for evaluating surgically proven lesions of the labrum and articular cartilage? AJR Am J Roentgenol. 202(1):160-9, 2014
                                                                  7. Anderson LA et al: Coxa profunda: is the deep acetabulum overcovered? Clin Orthop Relat Res. 470(12):3375-82, 2012
                                                                  8. Tannast M et al: Femoroacetabular impingement: radiographic diagnosis--what the radiologist should know. AJR Am J Roentgenol. 188(6):1540-52, 2007
                                                                  9. James SL et al: MRI findings of femoroacetabular impingement. AJR Am J Roentgenol. 187(6):1412-9, 2006
                                                                  10. Pfirrmann CW et al: Cam and pincer femoroacetabular impingement: characteristic MR arthrographic findings in 50 patients. Radiology. 240(3):778-85, 2006